Code P0403

Good afternoon.

There is nothing on the list for the EGR system at all.

This code is referring to either the PCM internal short or the EGR solenoid itself.

Roy

Symptom/DTC P0403
Descriptor
Eegr Electric Motor Windings Or Circuits To The Pcm Shorted Or Open
Egr Vacuum Regulator Solenoid Circuit Malfunction
Probable Causes
EGR Vacuum Regulator (EGRVR) Solenoid Circuit Open (Non-Electric Exhaust Gas Recirculation Vehicles)
EGR Vacuum Regulator (EGRVR) Solenoid Circuit Short to Ignition Switched Power (VPWR) or Ground (Non-Electric Exhaust Gas Recirculation Vehicles)
EGR Vacuum Regulator (EGRVR) Solenoid Damaged (Non-Electric Exhaust Gas Recirculation Vehicles)
Electric Exhaust Gas Recirculation (EEGR) Connector Not Seated (For Electric Exhaust Gas Recirculation Vehicles)
Electric Exhaust Gas Recirculation (EEGR) Motor Short Circuit (For Electric Exhaust Gas Recirculation Vehicles)
Electric Exhaust Gas Recirculation (EEGR) Motor Windings Open (For Electric Exhaust Gas Recirculation Vehicles)
Harness Short Circuit From Powertrain Control Module (PCM) to Electric Exhaust Gas Recirculation (EEGR) (For Electric Exhaust Gas Recirculation Vehicles)
Ignition Switched Power (VPWR) Open to EGR Vacuum Regulator (EGRVR) Solenoid (For Non-Electric Exhaust Gas Recirculation Vehicles)
Open Circuit In Harness From Powertrain Control Module (PCM) to Electric Exhaust Gas Recirculation (EEGR) (For Electric Exhaust Gas Recirculation Vehicles)
Powertrain Control Module (PCM) Damaged (Non-Electric Exhaust Gas Recirculation Vehicles)
Powertrain Control Module (PCM) Open Circuit (For Electric Exhaust Gas Recirculation Vehicles)
Powertrain Control Module (PCM) Short Circuit (For Electric Exhaust Gas Recirculation Vehicles)

EGR Vacuum regulator showed 19 ohms. When I disconnect hose from EGR there is no changes. Also, there is not a catalytic converter. Sometime car will not start it cranks, after two minutes it start normally.

EGR valve maybe bad? My friend sad that when you disconnect hose car must change sound but it has not changed.

Okay, the next thing I would do is to check the fuel pressure.

If you have low pressure, it will cause delayed starting as you have at the moment.

Roy

p0403 can caused bad fuel pressure?

No, there is no connection of the EGR system to the fuel pump control.

Roy

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Thank you tomorrow I will try check pressure, but next problem is EGR. I think EGR valve is broken.

In order to check that system with the list I sent you, you need an advanced scan tool to turn on the solenoid to see if it responds to the commands from the PCM.

Keep me updated.

Roy

It respond my mechanic tried and it responds. We also checked EGR vacuum regulator showed 19 ohms, in my country there is no good mechanics for Ford.

When vacuum is applied, does the valve open?

If it opens the engine should stumble and may stall.

Roy

No its never happening, car never changes sound. Also, when I disconnect hose from EGR it never changes sound.

Does it have vacuum?

How can I check that?

Feel the end of the hose. It must have vacuum sent from the solenoid to operate. That is critical in operation of the valve.

Roy

If it working I must feel from the disconnected hose its correct?

Correct. You should feel vacuum when you accelerate.

Roy

Hi, today I checked vacuum and there is vacuum.

The next step is to remove the valve and see if the passages are clear. Start the car with the valve removed and you should hear a good exhaust leak and the engine will run very rough.

Roy

I cleaned valve two times with carburetor cleaner. I will remove EGR valve today again.

No, I said nothing about cleaning the valve. You need to make sure the engine passages are clear.

When you have vacuum to the valve, can you see it moving?

Roy

No, I cannot see if it is moving.

Remove the valve and run the engine and see if it moves with the line attached?

Roy

Hi, I removed EGR and car start idling but EGR not moving.

Okay, when it was idling did you hear a loud exhaust leak, and a loud exhaust noise as well?

Yes.

Okay, was there a loud hissing noise from a very large vacuum leak? Did the engine stumble and almost shut off?

If it did not then that passageway is blocked and that is why the code is setting.

Roy

When I started car, car almost shut off, but than she was idling, sound was very loud.

Okay, sounds like the passages are clear.

Did you replace the EGR valve?

Roy

Hi, I replaced EGR but MIl is still on. Today I checked EGR hose and it was broken maybe it is a problem.

It sure can be. It will not allow the valve to open.

Roy